Seeking Certainty: New Book Invites Eastern Orthodox Readers to Find Peace With God

FAITH NEWS SERVICE – Certainty for Life: An Invitation to those in Eastern Orthodoxy by John Diacos is a compelling exploration of faith, assurance, and the search for peace with God, written especially for those from an Eastern Orthodox background.

Drawing on personal stories, biblical teaching, and the wisdom of early Church Fathers, this enlightening book addresses the deep longing for certainty that many experience in their spiritual lives.

The author begins by sharing his own journey—growing up immersed in Orthodox tradition, yet lacking confidence in his relationship with God. The book reflects on what he discovered as he searched the Scriptures, studied theology, as well as the many years spent conversing with those of Orthodox background.

Certainty for Life systematically examines why so many feel distant from God, the limitations of relying on tradition, good works, or religious rituals for assurance, and the futility of trying to earn God’s favour through self-effort.

Central to the book is the message that true certainty comes not from human achievement, but from God’s initiative in seeking and saving people through Jesus Christ. The author explains the significance of Jesus’ death and resurrection, showing how these events provide a solid foundation for forgiveness, peace, and eternal life. Through clear explanations and practical guidance, readers are invited to respond personally to God’s offer of grace, to experience transformation, and to live with confidence in God’s promises.

Mark Powell wrote in his review in Australian Presbyterian: “Certainty for Life is a book which I hope will—by the grace of God—make a profound and far-reaching impact. It is a book to both buy, read and then give prayerfully away. Diacos has produced an excellent resource for the church and coupled with his apologetic material which helps people to further engage with people from an Orthodox background with the truth of the Gospel, Certainty for Life comes highly recommended.”

With sections addressing common questions about tradition, authority, justice, and the role of good works, as well as real-life testimonies of changed lives, Certainty for Life is both an invitation and a roadmap for anyone seeking assurance of God’s love and acceptance. It is a resource for personal reflection and group study. Most importantly, this is a book to be shared with our Orthodox friends to aid in their journey towards spiritual certainty.

Raised in a Greek Orthodox family, John writes from a heartfelt desire to share with others the assurance of peace with God. Along with his wife Elizabeth, they have raised five adult children and live in Melbourne, Australia. John currently works as a medical practitioner but still holds out hope of being called up to play for Australia’s Socceroos.

Certainty for Life, published by Ark House, is now available globally.